Year	Percent change (Units)
1980	14.297
1981	-9.001
1982	4.490
1983	0.066
1984	2.193
1985	12.352
1986	10.095
1987	6.740
1988	11.556
1989	16.111
1990	8.600
1991	12.441
1992	13.838
1993	3.618
1994	11.501
1995	11.024
1996	12.117
1997	5.756
1998	6.428
1999	6.994
2000	6.072
2001	7.611
2002	3.243
2003	7.010
2004	15.015
2005	3.274
2006	5.225
2007	6.752
2008	-0.504
2009	-4.203
2010	1.869
2011	5.192
2012	0.323
2013	3.072
2014	0.576
2015	-2.578
2016	0.727
2017	-0.503
2018	4.609
2019	-2.696
2020	-1.139
2021	-1.547
2022	0.971
2023	0.082
2024	6.168
2025	5.017
2026	2.776
2027	2.437
2028	2.207
2029	1.917